NEW DIATOMS. 
55 
Navicula Kutzingiana. H. L. 8. 
Frustules linear, valves scarcely inflated, with rounded ends, and 
three or four conspicuous stria3 radiating from the central nodule, 
and which are prominent also, along with the central nodule, in 
f. v. Frustules in f. v. quadrangular, frequently adhering and 
forming a short filament ( Diadesmis ), and with two distinct 
intra-marginal (bead-like) vittse at either end. Length *0006 to 
*00085, breadth f. v. *00035, s. v. *00021. Strias about 50 in 
. 001 . 
Avranches, Normandy, France (de Brebisson). 
Navicula parvula. U. L. 8. 
Frustules small, valves lanceolate, with acute apices. Strige 
divergent, and readily seen. Frustules linear in f. v. with rounded 
ends. Length *0005 ; breadth *00015. Striae 42 in *001. 
Villerville, France (de Brebisson). 
Nitszchia Kittoni. II. L. S. 
Frustules linear, valves lanceolate, with sharp and slightly 
constricted apices, marginal punctae very distinct, 16 in *001 and 
quite prominent in f. v. Striae faint. Length *0007 to *001 ; 
breadth, *0002. 
Biver Catuche, Caracas, Venezuela (F. Kitton). 
Raphoneis australis. H. L. 8. 
Frustules somewhat variable in size, valves cuneate, rounded at 
the larger end, and coarsely moniliform striate, striae interrupted 
by a smooth blank space, frustules slightly cuneate in f. v. Length 
*0005 to *00086 ; breadth, *00022 to *0004. Striae about 30 in 
* 001 . 
Royal Sound, Kerguelen’s Land (Dr. J. H. Kidder). 
Rhizosolenia Eriensis. H. L. S. 
Frustules of medium size, compressed, and somewhat flattened ; 
six to twelve times as long as broad ; annuli on the dry frustules 
conspicuous, alternate, and with a ziz-zag median connection, valves 
finely striate, bristles nearly or quite as long as the frustules, and 
with the calyptra excentric, lying nearly in a line with one margin 
of the frustule when the flat side is in view. Length of frustules 
*003 to *006. 
Buffalo, N.Y. ; Lake Erie; Cleveland, Ohio; Lake Michigan. 
Cestodiscus Baileyi. II. L. 8- 
Disc circular, diam. *0025 to *0028, inflated, and with distinct 
radiating granules, and showing more or less the characteristic 
subulate blank spaces of Actinocyclus ; without umbilicus; pro- 
cesses intra-marginal, small, and numerous ; the punctae near the 
margin of the valve are in parallel rows, 27 in *001. Secondary 
plate or septum, with a large central opening, fringed with some- 
what irregular rays, which do not reach the margin. 
Lower Lake Klamath, Oregon (Lt. Williamson). 
Amphora mucronata. H.L.S. 
Frustules in f. v. broadly oval, dorsum with distant longitudinal 
lines, ventral surface with indistinct longitudinal lines, or furrows, 
central nodule elongated and pointed (mucronate), end touching 
